Puttygen rsa 4096

  • Use the ssh-keygen utility to create your key. For a 2048 bit RSA key do:

  • For increased security you can make an even larger key with the -b option. For example, for 4096 bits do:

    ssh-keygen -t rsa -b 4096

    The OSL recommends using RSA over DSA because DSA keys are required to be only 1024 bits.

  • When prompted, you can press Enter to use the default location (/home/your_username/.ssh/id_rsa on Linux, or /Users/your_username/.ssh/id_rsa on Mac) if you don’t already have a key installed, or specify a custom location if you are creating a second key (or just want to for whatever reason).
  • Enter a passphrase at the prompt. All people connecting to OSL servers must use a passphrase. This is just a password used to unlock your key. If someone else gets a copy of your private key they will be able to log in as you on any account that uses that key, unless you specify a passphrase. If you specify a passphrase they would need to know both your private key and your passphrase to log in as you.
  • After you re-enter your passphrase, ssh-keygen may print a little picture representing your key ((you don’t need to worry about this now, but it is meant as an easily recognizeable fingerprint of your key, so you could know if it is changed without your knowledge - but it doesn’t seem to be widely used)) then exit.
  • Your private key should now be in the location you specified, and your public key will be at that same location but with ‘.pub’ tacked onto the filename.
  • Note

    If you are creating this key for use with an OSL SSH account, copy and paste the public key into your ticket. If we didn’t ask you for a public key but you want one added to your account email it to support@osuosl.org, being sure to specify who you are and what project(s) you are associated with.

  • Or, to use the public key on a computer under your control, add it to ~/.ssh/authorized_keys (you can specify multiple public keys, one per line).
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    Puttygen SSH2 rsa

    Puttygen usage

    Puttygen rsa dsa

    Puttygen.exe help